It was at the 1992 Chicago Auto Show that Ford's high performance arm, the Special Vehicle Team (SVT), entered the automotive scene with the debut of the 1993 SVT Mustang Cobra and SVT F-150 Lightning. In the 20 years since, more than seven different SVT vehicles have been produced around the attributes of "Performance, Substance, Exclusivity and Value." To mark the 20th anniversary of SVT, the company has decided to let its top down by debuting the new 2013 Ford Shelby GT500 convertible at the 2012 Chicago Auto Show. The topless version packs the same 650 horsepower powerplant as the hardtop model that debuted in L.A. late last year.